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On this day in 1977 – June 2nd – 14 delegates from nations around the world plus the UN Secretary-General recorded greetings for the Voyager space probes' "golden record"..

Voyagers 1 and 2 were launched a month apart later in the year. Decades later Voyager 1 became the first probe to cross the heliopause into interstellar space.

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On this day in 1948 – June 3rd – the 200-inch Hale telescope was dedicated at Palomar Observatory in California.

The telescope was a marvel of design and precision engineering and the largest in the world for several decades.

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On this day in 1819 – June 5th – British mathematician and astronomer John Couch Adams was born.

His most famous achievement was predicting the existence and position of Neptune, using only mathematics. But Urbain LeVerrier had independently made the calculations and the planet was discovered using his calculations. (Who discovered Neptune?)

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On this day in 1932 – June 6th – Apollo astronaut Dave Scott was born.

Scott was the commander of Apollo 15 and the seventh person to walk on the Moon.

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On this day in 1625 – June 8th – Italian-French astronomer Giovanni Domenico (Jean Dominique) Cassini was born.

Cassini was one of the most important astronomers of the 17-18th centuries, and was the first of four Cassinis to be director of the Paris Observatory. His study of Saturn, including discovering four of Saturn's moons, led to the NASA/ESA/ASI Cassini–Huygens mission bearing his name.

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On this day in 1812 – June 9th – German astronomer Johann Gottfried Galle was born.

Galle is best known for his being the first person to see the planet Neptune, knowing what he was seeing. This followed his search for the planet using the calculations Urbain Le Verrier had sent him. (Who discovered Neptune?)

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On this day in 2003 – June 10th – NASA's Mars rover Spirit was launched.

The original plans had Spirit on Mars for three months, but the mission wasn't finally terminated until May 2011.

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On this day in 2008 – June 11th – the Fermi Gamma Ray space telescope was launched.

The space observatory performs gamma-ray observations from low Earth orbit. Gamma rays are the highest energy radiation in the electromagnetic spectrum. The mission is a joint venture of NASA, the United States Department of Energy, and government agencies in France, Germany, Italy, Japan, and Sweden.

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On this day in 1831 – June 13th – James Clerk Maxwell was born.

Maxwell was the Scottish scientist who showed that electricity, magnetism, and light are all aspects of the same phenomenon, electromagnetism.

Last edited by Mona - Astronomy; 06/13/17 06:25 AM.
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On this day in 1831 – June 13th – the Japanese spacecraft Hayabusa ("Peregrine Falcon") returned the first samples from an asteroid.

Hayabusa studied asteroid 25143 Itokawa and then landed on the asteroid to collect small grains of material.

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